Please explain and show your work

Chapter 4, Section 4.2, Question 020 Use the first derivative to find all critical points and use the second derivative to find all inflection points. Use a graph to identify each critical point as a local maximum, a local minimum, or neither. f (x) =x - 10x + 45 Enter the exact answers in increasing order. If there is no answer, enter "NA". The critical point at x = is The critical point at x = is The inflection point is x =